Out of all the popular cities in Australia, Melbourne is the cheapest city to rent a car in at just S$ 21/day. Renting a car in Melbourne is 76% cheaper than renting one in Alice Springs where the per day rate is around S$ 85. Other fairly inexpensive cities in Australia to get a rental car in are: Adelaide (S$ 25/day), Sydney (S$ 26/day), and Brisbane (S$ 28/day). While these cities typically have cheaper prices than the rest of the country, travellers looking to rent a car in Sydney should expect to spend around S$ 26/day on their transportation. The most popular city to rent a car in Australia is Sydney.